And tom millee



(No Model.) 28heets-Sheet 1.

T. S. POGLB, deod & T.. MILLER, Jr.

E T. WARNER, Administrator of T! S. POOLE. Roller M111 forGIIHdIHgGIBJIH.

i .No. 238,001. Patented Feb. 22,1881.

Inven 110148 NJETERS. PHOTO-LITMOGRAFHER, WASHINGION. D. c

UNITED STATES PATENT OFFICE.

THOMAS S. POOLE, OF WILMINGTON, DELAWARE, AND TOM MILLER, JR.,

OF ST. LOUIS, MISSOURI. THOMAS S. POOLE, DECEASED.)

(E. TATNALL WARNER, ADMINISTRATOR OF ROLLER-MILL FOR GRINDING GRAIN.

SPECIFICATION forming part of Letters Patent No. 238,001, dated February22, 1881. Application filed May 11, 1880. No model.)

To all whom it may concern Be it known that we, THOMAS S. PooLE, ofWilmington, county of New Castle, State of Delaware, and TOM MILLER, Jr., of city of St.

Louis, State of Missouri, have invented certain Improvements in Adjusting-Roller Grinding-Mills, of which the following is a specification.

Our invention relates to the separating of the rollers in roller,grinding-mills after they have been adjusted; and it consists in apcculiar construction and arrangement of devices for separating theshifting roll after the adjustable roll has been set in working posi- I5 tion and bringing it back again, so that the rolls will have theirformer adjusted relation. One of the great difficulties has been, inusing roller-mills, that the miller had to adjust or set the adjustableroll every time the mill starts up. This is owing to the fact that mealwill not pass between the rollers while adjusting with the proper effectuntil the mill is under headway, and the belts will not stay upon theroller-pulleys when the mill is start- 2 5 ing, the power required beingtoo great. So

it necessitates resetting the adjustable rollerevery time the millstarts up, which requires much skill and time. To obviate thisdifficulty I use a rod or shaft between the two inside orshiftingrollers of a double-roller machine, said shaft running parallelwith the rollers from end to end and journaled in the main frame. Thisshaft has on each end a double cam, also a lever at either or both ends.5 The double cam is horizontal and has in each end a socket, in which isfitted a link or bar, which links, at their other end, fit into a socketin the side of the boxes, said links and cam thereby forming atoggle-joint.

By reference to the drawings herewith filed as a part of thisspecification, the improved device will be easily understood.

F represents the shaft; E, the double cam; D, the toggle-joint,consisting of the cam E 5 and links G G; O O, the boxes; I, the lever.

Figure 1 is a side elevation, showing the end of the shaft F and theconstruction of the toggle D and its connection with the'boxes O O andlever I. Fig. 2 is a side view of the toggle, the dotted lines showingthe two positions the toggle takes as the lever I is moved forward orbackward.

The mode of operation can be easily understood by referring to thedrawin The lever I, as it is moved forward or backward, will throw thetoggle into a zigzag position, as indicated by the dotted lines in Fig.2, thus allowing the shifting rollers to retire from their workingposition, being forced back by means of suitable springs, the boxes ofsaid rollers being fitted in the frame in a similar manner to theadjustable rollers, so as to slide forward and back as the position ofthe toggle is changed. After the adjustable rollers have been set up totheir working position, then, by this improved device, the shiftingrollers can be separated from them and brought back exactly to theirworking position, at the pleasure of the miller, by simply working thelever with the hand.

Instead of the toggle-joint at each end of the shaft F, an equivalentmay be usednamely, an eccentric cam, as shown in Fig. 4; or, iustead ofthe lever, a hand-wheel may be used. This same device may be applied toa single or two roller mill, the shaft F extending the full length ofthe adjustable roller with a single instead of double toggle, the leverI being the same.

What we claim is-- In a grinding-mill provided with duplicate sets ofrolls, the outermost rolls of each set being adjustable in thesupporting-frame, the combination, with the two inner rolls forcedtogether by a spring-pressure against their journal-boxes O O, of thedouble cams E E and connecting-links G G, mounted upon theintermediatelyjournaled shaft F, provided with operating-lever I andmeans for holding the same in fixed position, substantially as shown anddescribed.

- THOMAS S. POOLE.

TOM MILLER, JR.

Witnesses for T. S. Poole:

JAMES M. WATSON, J. MARTIN PooLE, Jr.

Witnesses for Tom Miller, J r.:

H. M. WILoox, O. B. GIVENS.

